Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=true, so safety is covered. The description adds genuinely useful context beyond annotations by naming the required permission scope (employees.read), which tells the agent about auth failure modes. It does not cover behavior for missing/not-found IDs, but the permission note is a real value-add.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Two short clauses, front-loaded with the action and scoping, then the permission requirement. Nothing is wasted, though the phrasing is telegraphic rather than fully explanatory.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple one-param read tool with no output schema, the description covers purpose and auth. However, it omits what the ID refers to and gives no sense of the returned employee shape, which matters given zero schema description coverage.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0% and the single parameter 'id' (integer, >0) has no description anywhere. The description says 'one employee' but never clarifies that 'id' is the employee identifier, leaving the agent to infer it.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource ('Read one employee'), and 'one' implicitly contrasts with the sibling builderprime_list_employees. The distinction is not made explicit, but an agent can tell it's a single-record fetch.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The word 'one' implies this is the single-record counterpart to builderprime_list_employees, but the description never names that alternative or says when to prefer it over a list/search. Usage is implied rather than stated.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.